Buying a new PC, help plzx

[Angrist]

Ok, I suddenly changed my mind when I saw this one:
http://www.paradigit.nl/configurator.php?system=2172
Processor Intel® Core™ 2 Quad Q6600 4x 2,4 GHz
Besturingssoftware Legitieme Windows Vista® Home Premium
Geheugen 4 GB DDR2
Harde schijf 500 GB
CD / DVD - Speler DVD±ReWriter, dual layer en LightScribe
Videokaart NVIDIA GeForce 8600 GT TurboCache , tot 1791 MB
Interface Onboard: Audio, Gbit netwerk, USB , Draadloos , FireWire , Geheugenkaart lezer
Software MS Works
Toetsenbord/muis PS/2 toetsenbord en optische muis
Garantie 1 jaar pickup & return
Merk HP
Type Compaq Presario SR5310NL

For €699, so €50 more than the other one. What do you think? What does TurboCache mean? Sounds like virtual memory to me... will that work under Windows XP?